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読み込んだファイルの内容を返します。このプロパティは読み込みが終了した後に有効になり、プロパティのデータ型は読込処理を行うメソッドによって変わります。

構文

var file = instanceOfFileReader.result

文字列または ArrayBuffer です。どちらであるかは読込処理を行うメソッドによって変わります。

仕様

Specification Status Comment
File API
The definition of 'FileReader' in that specification.
Working Draft Initial definition

ブラウザ実装状況

Feature Firefox (Gecko) Chrome Edge Internet Explorer Opera Safari
Basic support 3.6 (1.9.2)[1] 7 (Yes) 10 12.02[2] 6.0
Support in Web Workers 46 (46) (Yes) (Yes) No support (Yes) No support
error property uses DOMException, not DOMError 58 (58) (Yes) (Yes) No support (Yes) No support
Feature Firefox Mobile (Gecko) Android Edge IE Mobile Opera Mobile Safari Mobile
Basic support 32 3 (Yes) 10 11.5 6.1
Support in Web Workers 46.0 (46) (Yes) (Yes) No support (Yes) No support
error property uses DOMException, not DOMError 58.0 (58) ? (Yes) No support (Yes) No support

[1] Prior to Gecko 2.0 beta 7 (Firefox 4.0 beta 7), all Blob parameters below were File parameters; this has since been updated to match the specification correctly. Prior to Gecko 13.0 (Firefox 13.0 / Thunderbird 13.0 / SeaMonkey 2.10) the FileReader.error property returned a FileError object. This interface has been removed and FileReader.error is now returning the DOMError object as defined in the latest FileAPI draft.

[2] Opera has partial support in 11.1.

関連情報

ドキュメントのタグと貢献者

このページの貢献者: clariroid
最終更新者: clariroid,